differences between Tivo and DTV's receiver

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I did several search variations trying to find a thread that explains the differences between a DTV unit with Tivo versus the newer units that don't have Tivo. If there is a thread out there that lists these differences, can someone point it out to me?

I guess the main thing I'm wondering is if I had to replace one of my series 2 units, which I have set up with networking, Tivowebplus, etc., I'm guessing that I won't be able to do any of this with a unit that doesn't have Tivo ? Can anyone elaborate?

Thanks